Many Rich, Regular Clusters of Galaxies Contain Substantial Amounts of Very

question 177

Multiple Choice

Many rich, regular clusters of galaxies contain substantial amounts of very hot, intergalactic gas. What is believed to have produced this hot gas?

• A) collisions between galaxies in the cluster
• B) bursts of star formation in merging galaxies
• C) supernovae (exploding stars)
• D) jets of gas ejected by supermassive black holes at the centers of the galaxies

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Definitions:

Cyclothymic Disorder

A chronic mood disorder characterized by alternating periods of mild depression and hypomania.

Chronic

Referring to a health condition or disease that is persistent or long-lasting in its effects, often for more than three months.

More Cyclic

Involving or characterized by cycles; often refers to conditions or processes that recur in cycles.

Dangerous

Involving potential risk, harm, or danger to someone’s safety or health.